CN109073933B - Color conversion film, and backlight unit and display device including the same - Google Patents

Color conversion film, and backlight unit and display device including the same Download PDF

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Publication number
CN109073933B
CN109073933B CN201780024297.7A CN201780024297A CN109073933B CN 109073933 B CN109073933 B CN 109073933B CN 201780024297 A CN201780024297 A CN 201780024297A CN 109073933 B CN109073933 B CN 109073933B
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color conversion
light
substituted
color
conversion film
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CN109073933A (en
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申东穆
金娜丽
安秉寅
高贤星
朴世晶
吴惠美
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LG Chem Ltd
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LG Chem Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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    • G02B5/23—Photochromic filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • G02F1/1333—Constructional arrangements; Manufacturing methods
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    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/422—Luminescent, fluorescent, phosphorescent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/202—LCD, i.e. liquid crystal displays
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
    • C09K2211/10—Non-macromolecular compounds
    • C09K2211/1003—Carbocyclic compounds
    • C09K2211/1007—Non-condensed systems
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
    • C09K2211/10—Non-macromolecular compounds
    • C09K2211/1018—Heterocyclic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
    • C09K2211/18—Metal complexes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
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    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/02—Materials and properties organic material
    • G02F2202/022—Materials and properties organic material polymeric
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

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  • General Physics & Mathematics (AREA)
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Abstract

The invention described in this specification relates to a color conversion film, a backlight unit including the same, and a display device including the same, the color conversion film including: a color conversion layer comprising a resin matrix and an organic fluorescent substance that emits light having a wavelength different from that of irradiated light when irradiated with light including a wavelength of 450nm, wherein the color conversion layer comprises a color shift compensation polymer in the color conversion layer or in an additional layer provided on the color conversion layer, the color shift compensation polymer enabling a color difference change of emitted white light to be within 0.05 when the entire surface of the color conversion layer is irradiated with blue light having a luminance of 600 nit for 1000 hours at 60 ℃.

Description

Color conversion film, and backlight unit and display device including the same
Technical Field
This application claims priority and benefit to korean patent application No. 10-2016-.
The present application relates to a color conversion film, and a backlight unit and a display device including the same.
Background
As large screen televisions become more prevalent, televisions have also become high definition, slimmer, and high functionality. Since the high-performance and high-definition OLED televisions still have a price competitiveness problem, the market of the high-performance and high-definition OLED televisions has not really started yet. Accordingly, efforts have been continuously made to secure the advantages of the OLED similarly to the LCD.
As one of the efforts, a number of quantum dot related technologies and prototypes have recently been implemented. However, cadmium-based quantum dots present safety issues, such as usage limitations, and thus, there is an increasing interest in manufacturing backlights using cadmium-free quantum dots (which are relatively free of safety issues).
Disclosure of Invention
Technical problem
The present application is directed to providing a color conversion film, and a backlight unit and a display device including the same. Technical scheme
An exemplary embodiment of the present application provides a color conversion film, including: a color conversion layer; and a color shift compensation layer (color shift compensation layer), wherein the color conversion layer comprises a resin matrix and an organic fluorescent substance dispersed in the resin matrix and emitting light having a wavelength different from that of the irradiated light when irradiated with light including a wavelength of 450nm, and the color shift compensation layer comprises a color shift compensation polymer enabling a color difference change of the emitted white light to be 0.05 or less when the entire surface of the color conversion film is irradiated with blue light having a luminance of 600 nit at 60 ℃ for 1000 hours.
Here, irradiating the entire surface of the color conversion film with blue light means irradiating the entire surface of the color conversion film with blue light emitted by the light source by: blue light is converted into a surface light source by a stacked structure of a backlight unit including a light guide plate, a light collecting film, and a brightness enhancing film.
By blue light is meant light comprising light of a wavelength of 450 nm. According to an example, the blue light may have a maximum luminescence peak of 450 nm.
According to another exemplary embodiment, the rate of decrease of the transmittance of the color shift compensating polymer with respect to light having a wavelength of 450nm satisfies the equation [ T [ ]@450nm(％)＝T@450nm-int(%) -ax (time)]And in this case, a is a constant for adjusting the white coordinates. The transmittance decrease rate can be measured by a method of: the backlight unit to which the color conversion film containing the color shift compensation polymer was applied was driven, and the transmittance reduction ratio was measured by measuring the transmittance at 450nm according to the driving time.
According to an example, when the color shift compensating polymer is exposed to blue light, the transmission of blue light can be defined as a yellowing polymer that is inversely proportional to the exposure time.
According to yet another exemplary embodiment of the present application, the color conversion film may further include a transparent film disposed on at least one surface thereof. The transparent film is in direct contact with the color conversion film or is adhered to the color conversion film by an adhesive layer.
Yet another exemplary embodiment of the present application provides a backlight unit including a color conversion film.
Yet another exemplary embodiment of the present application provides a display device including a backlight unit including a color conversion film.
Advantageous effects
According to the exemplary embodiments of the present application, by including an organic fluorescent substance in a color conversion film, luminance and color gamut are excellent, a manufacturing process is simple, and manufacturing cost is reduced, as compared to the case of applying an inorganic fluorescent substance or a quantum dot material.
When the organic fluorescent substance contained in the color conversion film is decreased, the amount of light absorbed by the fluorescent substance among light irradiated by the light source of the backlight unit is decreased, and thus, the spectrum of mixed light in which light emitted by the light source and light converted by the color conversion film are mixed is changed. According to the exemplary embodiments described in this specification, by using the color shift compensation polymer having a characteristic that the transmittance of blue light (450nm) decreases according to the exposure time when receiving light irradiated by the light source of the backlight unit, even when the fluorescent substance decreases as described above, the spectral change of the mixed light in which the light emitted by the light source and the light converted by the color conversion film are mixed can be minimized. Therefore, even when the display is driven for a long time, it is possible to thereby extend the service life of the display by preventing the color sensation from being distorted compared to the initial stage.
Drawings
Fig. 1 to 4 illustrate cross sections of a color conversion film according to an exemplary embodiment of the present application.
Fig. 5 and 6 illustrate a backlight unit according to an exemplary embodiment of the present application.
Fig. 7 and 8 illustrate scattering patterns provided in a light guide plate of a backlight unit according to an exemplary embodiment of the present application.
Fig. 9 and 10 illustrate a display device according to an exemplary embodiment of the present application.
Fig. 11 shows a light emission spectrum of the backlight unit manufactured in the embodiment.
Fig. 12 and 13 show the color difference over time in the comparative example and the embodiment, respectively.
Detailed Description
A color conversion film according to an exemplary embodiment of the present application includes a color conversion layer including a resin matrix and an organic fluorescent substance dispersed in the resin matrix and emitting light having a wavelength different from that of irradiated light when irradiated with light including a wavelength of 450 nm. Here, the color conversion film is characterized in that: the color shift compensation polymer is included in the color conversion layer or in an additional layer disposed on at least one surface of the color conversion layer, and enables variation in chromatic aberration of emitted white light within 0.05 when the entire surface of the color conversion film is irradiated with blue light having a luminance of 600 nits, which is emitted from a light source and is converted into a surface light source through a stacked structure of a backlight unit including a light guide plate, a light collecting film (e.g., a prism sheet), and a brightness enhancement film, at 60 ℃ for 1000 hours.
According to an exemplary embodiment of the present application, the color difference variation means a color difference in a specific time (t), and may be represented by the equation [ sqrt ((Wx (t) -Wx (initial stage))2+ (Wy (t) -Wy (initial stage))2)]And (4) obtaining. In this case, Wx (t), Wx (initial stage), Wy (t), and Wy (initial stage) respectively mean an x value of a white coordinate after a certain time (t) elapses, an x value of a white coordinate in the initial stage, a y value of a white coordinate after a certain time (t) elapses, and a y value of a white coordinate in the initial stage.
Here, irradiating the entire surface of the color conversion film with blue light means: the entire surface of the color conversion film is irradiated with blue light emitted from a light source and converted into a surface light source through a stacked structure of a backlight unit including a light guide plate, a light collecting film (e.g., a prism sheet), and a brightness enhancing film (e.g., DBEF or APF). The blue light passing through the stacked structure of the backlight unit is uniformly emitted over the entire surface of the backlight unit, and in this case, a luminance of 600 nits adds the same energy to the entire area of the color conversion film. The backlight unit may be an edge type (edge light type) system.
According to an example, the blue light has an emission peak at 450nm and has a full width at half maximum (full width at half maximum) of 30nm or less. The full width at half maximum means a width of a light emission peak when a height of light emitted from the film is half of a maximum height at a maximum light emission peak of the light. Full width at half maximum can be measured in the film state. The blue light may be light having a single peak in emission intensity distribution.
In one exemplary embodiment of the present application, the color shift compensating polymer is included in an additional layer disposed on at least one surface of the color conversion layer, and the additional layer includes the color shift compensating polymer in an amount of 10 wt% to 100 wt%. That is, the color shift compensating polymer may be included in an amount of 10 to 100 weight percent, based on the total weight of the additional layer.
When one member is "disposed on" one surface of "another member in this specification, this includes not only a case where one member is in contact with another member but also a case where another member is present between two members. For example, in one exemplary embodiment of the present application, the inclusion of the color shift compensation polymer in the additional layer disposed on at least one surface of the color conversion layer includes not only a case where the additional layer including the color shift compensation polymer is disposed in direct contact with the color conversion layer, but also a case where another member is disposed between the color conversion layer and the additional layer including the color shift compensation polymer.
That is, according to an exemplary embodiment of the present application, the color shift compensation layer does not need to be in contact with the color conversion layer, and yet another layer may be disposed between the color conversion layer and the color shift compensation layer, if necessary. For example, as yet another layer disposed between the color conversion layer and the color shift compensation layer, for example, a brightness enhancement film such as a Double Brightness Enhancement Film (DBEF) or an Advanced Polarizing Film (APF), and/or a light collection film such as a prism sheet may be disposed.
In an exemplary embodiment of the present application, the color shift compensation layer means an additional layer comprising a color shift compensating polymer.
In one exemplary embodiment of the present application, the color conversion layer and the color shift compensation layer may each be provided in the form of a film.
According to another exemplary embodiment, the light source may be disposed between the color conversion layer and the color shift compensation layer.
According to an example of the present specification, when the entire surface of the color conversion film is irradiated with blue light converted to a surface light source with a luminance of 600 nits for 1000 hours at 60 ℃ as described above, the color shift compensation polymer enables a color difference change of the emitted white light to be 0.05 or less.
The color shift compensating polymer is a polymer comprising at least one of the following structures: such as benzene,Toluene, chlorobenzene, nitrobenzene, phenol, aniline, benzoic acid, anisole, xylene, furan, benzofuran, pyrrole, indole, imidazole, toluene, xylene, furan, toluene, xylene, furan, toluene, xylene,
Figure GDA0001832912550000051
Azoles, thiophenes, benzothiophenes, benzimidazoles, indazoles, benzotriazoles
Figure GDA0001832912550000052
Oxazole, isobenzofuran, isoindole, purine, benzothiophene, naphthalene, pyridine, quinoline, triazine, and benzotriazine, and particularly, epoxy resins such as polyamide, bisphenol a epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, and novolac epoxy resin; urethane resins containing an aromatic ring, such as Toluene Diisocyanate (TDI), methylene diphenyl diisocyanate (MDI), Xylene Diisocyanate (XDI) m-tetramethylxylene diisocyanate (TMXDI), naphthalene 1, 5-diisocyanate (NDI), Hydrogenated Xylene Diisocyanate (HXDI), p-phenylene diisocyanate (PPDI), and 4, 4' -dibenzyl diisocyanate (DBDI); polyvinylidene fluoride (PVDF); polyvinylidene chloride (PVDC), and the like.
According to yet another exemplary embodiment of the present application, the color shift compensation polymer may be included in the color conversion layer. When the color shift compensating polymer is included in the color conversion layer (fig. 1), the color shift compensating polymer may be included in an amount of 1 to 50 wt% based on the total weight of the color conversion layer.
According to still another exemplary embodiment of the present application, the color shift compensation layer may be composed of only the color shift compensation polymer, and may be composed of the color shift compensation polymer and another UV curable resin or thermoplastic resin, if necessary. The migration compensating polymer may be included in the migration compensating layer in an amount of 10 to 100 wt%.
The color shift compensation layer may be manufactured by forming the color shift compensation layer on a transparent substrate and then laminating the color shift compensation layer entirely on the outermost portion of the color conversion film by means of an adhesive layer (fig. 3), or may be manufactured by directly coating or stacking a color shift compensation polymer on the outer portion of the color conversion layer (fig. 2). Further, when two or more color conversion layers are stacked, for example, when a color conversion layer converting blue light into green light and a color conversion layer converting green or blue light into red light are stacked, a color shift compensation layer may be disposed between the stacked color conversion layers (fig. 4). Further, the color shift compensation layer may also be formed using a method of coating the color shift compensation layer onto a transparent substrate or a solution casting method, and may also be obtained as a separate color shift compensation layer by extrusion and stretching without a substrate. The color shift compensation layer preferably has a small thickness, for example, a thickness of 1 μm to 200 μm.
In the present application, a color shift compensation layer means a layer comprising a color shift compensation polymer.
According to still another exemplary embodiment of the present application, a transparent film may be disposed on one surface or both surfaces of the color shift compensation layer. For example, when the color shift compensation layer is applied to one surface of the color conversion layer by a casting method, transparent films may be provided on both surfaces of the color shift compensation layer.
According to still another exemplary embodiment of the present application, a transparent film is disposed on at least one surface of the color conversion layer. The transparent film is in direct contact with the color conversion layer or is adhered to the color conversion layer by an adhesive layer. When the color conversion film is manufactured by coating the composition for forming the color conversion layer on one surface of the transparent film, a separate adhesive layer may not be provided between the transparent film and the color conversion layer. Fig. 1 and 3 show an example in which a transparent film is provided on one surface of a color conversion layer and a transparent film is provided on the other surface of the color conversion layer through an adhesive layer.
The transparent film may be used as a support when manufacturing the color conversion layer, and may also be used as a protective film for preventing the color conversion layer from curling. The type of the transparent film is not particularly limited, and the material or thickness of the transparent film is not limited as long as the transparent film is transparent and can be used as a support or a protective film. Here, the transparency means that the transmittance of visible light is 70% or more. For example, a PET film may be used as the transparent film. If necessary, a barrier film may also be used as the transparent film. Those known in the art may be used as the barrier film.
An adhesive layer is used to adhere the transparent film to the color conversion film. The adhesive layer may be formed by using a material known in the art as long as the aforementioned object is not damaged. For example, the adhesive layer may be formed by using an adhesive tape or coating an adhesive composition.
According to an exemplary embodiment of the present application, a thermoplastic polymer or a thermosetting polymer may be used as a resin matrix of the color conversion layer. Specifically, as the material for the resin matrix, the following materials may be used: poly (meth) acrylic materials such as Polymethylmethacrylate (PMMA), Polycarbonate (PC) -based materials, Polystyrene (PS) -based materials, Polyarylene (PAR) -based materials, polyurethane (TPU) -based materials, styrene-acrylonitrile (SAN) -based materials, polyvinylidene fluoride (PVDF) -based materials, modified polyvinylidene fluoride (modified PVDF) -based materials, styrene-ethylene-butylene-styrene (SEBS) -based materials, hydrogenated styrene-ethylene-butylene-styrene (hydrogenated SEBS) -based materials, and the like. Since the thermoplastic polymer or the thermosetting polymer does not use UV energy generated during a UV curing process and does not have radicals or positive ions capable of attacking fluorescent substances, compared to the UV curable resin, the thermoplastic polymer or the thermosetting polymer can prevent light characteristics from being deteriorated by the UV energy or the radicals or the positive ions.
In general, when a quantum dot material or an inorganic fluorescent substance is used in a color conversion film, there is a problem in stability of the color conversion film due to a reaction with water or oxygen, and there is a problem in that production unit cost is high. Therefore, research has been conducted on a color conversion film to which an organic fluorescent substance having excellent brightness and color gamut, a simple manufacturing process, and low manufacturing cost is applied. However, the organic fluorescent substance has a problem that a color difference of white may occur due to deterioration of durability, and by using the color shift compensating polymer according to the present invention together with the organic fluorescent substance, the color difference as described above can be more effectively prevented.
That is, with respect to the problems occurring due to the reduction of the organic fluorescent substance contained in the color conversion film, even when the fluorescent substance is reduced as described above, the color conversion film according to one exemplary embodiment of the present invention can minimize the spectral change of the mixed light in which the light emitted by the light source and the light converted by the color conversion film are mixed by using the color shift compensation polymer having a characteristic that the light transmittance of blue light (450nm) is reduced according to the exposure time when receiving the light irradiated by the light source of the backlight unit. Therefore, even when the display is driven for a long time, it is possible to thereby extend the service life of the display by preventing the color sensation from being distorted compared to the initial stage.
In this respect, when an inorganic fluorescent substance or a quantum dot material is used instead of an organic fluorescent substance, the problem solution principle according to the application of the color shift preventing polymer described in the present application is not applicable because the advantages of the above-described organic fluorescent substance cannot be obtained and a specific problem occurring during the use of the organic fluorescent substance, i.e., a white color difference, does not occur. Specifically, in a color conversion film including a color conversion layer containing an inorganic fluorescent substance or a quantum dot material, when a color shift compensation polymer is contained in the color conversion layer on at least one surface of the color conversion layer, color difference due to the color shift preventing polymer may occur unlike the organic fluorescent substance, thereby causing spectral change.
In the present application, the color difference of white means that the white coordinates exhibit a color shift according to time during continuous irradiation with blue light.
According to an exemplary embodiment of the present application, the organic fluorescent substance is not particularly limited as long as the organic fluorescent substance is a fluorescent substance that emits light having a wavelength different from that of irradiated light when the organic fluorescent substance is irradiated with light including a wavelength of 450 nm. The emission of light having a wavelength different from that of the irradiated light means a case where the wavelength of the irradiated light does not need to overlap with that of the emitted light at all, and the entire wavelength of the irradiated light does not coincide with that of the emitted light, and also includes a case where only a part of the wavelength of the irradiated light is different from that of the emitted light. As the organic fluorescent substance, those known in the art can be used.
According to an example, as the organic fluorescent substance, a fluorescent substance that emits light having a wavelength different from that of irradiated light when the fluorescent substance is irradiated with light including a wavelength of 450nm may be used. For example, as the organic fluorescent substance, a fluorescent substance that has an emission peak at 450nm and a full width at half maximum of 40nm or less and emits light having a wavelength different from that of the irradiated light when the fluorescent substance is irradiated with light having an emission intensity distribution that is a single peak may be used. Here, the emitted light may be green light having a wavelength selected from a wavelength of 500nm to 560nm or red light having a wavelength selected from a wavelength of 600nm to 780nm, or a mixture thereof. For example, the organic fluorescent substance may include a fluorescent substance emitting red light by absorbing blue or green light, a fluorescent substance emitting green light by absorbing blue light, or a mixture thereof.
In the present application, definitions known in the art may be used for blue light, green light and red light, for example, blue light is light having a wavelength selected from 400nm to 500nm, green light is light having a wavelength selected from 500nm to 560nm, and red light is light having a wavelength selected from 600nm to 780 nm. In the present application, the green fluorescent substance absorbs at least a portion of blue light to emit green light, and the red fluorescent substance absorbs at least a portion of either blue light or green light to emit red light. For example, the red fluorescent substance may also absorb not only blue light but also light having a wavelength of 500nm to 600 nm.
As the organic fluorescent substance, according to an example, an organic fluorescent substance of the following chemical formula 1 may be used.
[ chemical formula 1]
Figure GDA0001832912550000081
In the chemical formula 1, the first and second,
X1and X2Are identical to or different from each other and are each independently a fluoro group or an alkoxy group,
R1to R4Are identical to or different from one another and are each independently hydrogen, a halogen radical, an alkyl radical, an alkoxy radical, a carboxyl-substituted alkyl radical, an unsubstituted or alkoxy-substituted aryl radical, -COOR, or an alkyl radical which is substituted by-COOR, and R is an alkyl radical,
R5and R6Are identical or different from one another and are each independently hydrogen, cyano, nitro, alkyl substituted by carboxyl, -SO3Na, or unsubstituted or arylalkynyl-substituted aryl, R1And R5May be linked to each other to form a substituted or unsubstituted hydrocarbon ring or a substituted or unsubstituted heterocyclic ring, and R4And R6May be linked to each other to form a substituted or unsubstituted hydrocarbon ring or a substituted or unsubstituted heterocyclic ring, and
r7 is hydrogen; an alkyl group; a haloalkyl group; or aryl unsubstituted or substituted with a halogen group, alkyl, alkoxy, aryl or alkylaryl.
According to an exemplary embodiment, R of chemical formula 11To R4Are the same as or different from each other, and are each independently hydrogen, fluoro, chloro, alkyl having 1 to 6 carbon atoms, alkoxy having 1 to 6 carbon atoms, alkyl having 1 to 6 carbon atoms substituted with carboxyl, alkyl having 1 to 6 carbon atoms substituted with carboxylic acid, aryl having 6 to 20 carbon atoms unsubstituted or substituted with alkoxy having 1 to 6 carbon atoms, -COOR, or alkyl having 1 to 6 carbon atoms substituted with-COOR, and R is alkyl having 1 to 6 carbon atoms.
According to another exemplary embodiment, R of chemical formula 11To R4Are the same or different from each other, and are each independently hydrogen, chloro, methyl, ethyl substituted with carboxyl, methoxy, phenyl substituted with methoxy, or methyl substituted with-COOR, and R is an alkyl group having 1 to 6 carbon atoms.
According to an exemplary embodiment, R of chemical formula 15And R6Are identical or different from one another and are each independently hydrogen, nitro, alkyl having 1 to 6 carbon atoms, carboxyAlkyl having 1 to 6 carbon atoms substituted by radicals, or-SO3Na。
According to an exemplary embodiment, R of chemical formula 15And R6Are identical to or different from each other and are each independently hydrogen, nitro, ethyl, carboxyl-substituted ethyl, or-SO3Na。
According to an exemplary embodiment, R of chemical formula 17Is hydrogen; an alkyl group having 1 to 6 carbon atoms; or an aryl group having 6 to 20 carbon atoms which is unsubstituted or substituted with an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an aryl group having 6 to 20 carbon atoms or an alkylaryl group having 7 to 20 carbon atoms.
According to an exemplary embodiment, R of chemical formula 17Is hydrogen, methyl, ethyl, propyl, butyl, pentyl, phenyl, methylphenyl, dimethylphenyl, trimethylphenyl, naphthyl substituted by biphenyl, naphthyl substituted by dimethylfluorene, dimethylphenyl substituted by terphenyl, methoxyphenyl or dimethoxyphenyl. According to one exemplary embodiment, chemical formula 1 may be represented by the following structural formula.
Figure GDA0001832912550000101
In the structural formula, Ar is a substituted or unsubstituted aryl group. For example, Ar may be an aryl group substituted with an alkyl group or an alkoxy group.
For example, compounds having the following structural formula may be used. The compound having the following structural formula has a maximum absorption wavelength at 490nm and a maximum luminescence peak at 520nm in a solution state.
Figure GDA0001832912550000111
However, the compound is not limited to this structural formula, and various organic fluorescent substances can be used.
According to another example, a fluorescent substance having a maximum absorption wavelength at 560nm to 620nm and a light emission peak at 600nm to 650nm in a solution state may be used as the organic fluorescent substance. For example, the compound of the following chemical formula 2 may be used.
[ chemical formula 2]
Figure GDA0001832912550000112
R11、R12And L are the same as or different from each other, and are each independently hydrogen, alkyl, cycloalkyl, aralkyl, alkylaryl, alkenyl, cycloalkenyl, alkynyl, hydroxyl, mercapto, alkoxy, alkoxyaryl, alkylthio, aryl ether, aryl thioether, aryl, haloaryl, heterocyclic, halogen, haloalkyl, haloalkenyl, haloalkynyl, cyano, aldehyde, carbonyl, carboxyl, ester, carbamoyl, amino, nitro, silyl, or siloxane group, or are linked to an adjacent substituent to form a substituted or unsubstituted aromatic or aliphatic hydrocarbon or heterocyclic ring,
m is a metal of valency M and is boron, beryllium, magnesium, chromium, iron, nickel, copper, zinc or platinum, and
Ar1to Ar5Are the same or different from each other and are each independently hydrogen; an alkyl group; a haloalkyl group; an alkylaryl group; an amine group; unsubstituted or alkoxy-substituted arylalkenyl; or aryl unsubstituted or substituted with hydroxy, alkyl or alkoxy.
According to one exemplary embodiment, chemical formula 2 may be represented by the following structural formula.
Figure GDA0001832912550000121
The fluorescent substance has a full width at half maximum of a light emission peak of 40nm or less in a solution state and a full width at half maximum of a light emission peak of about 50nm in a film state.
The content of the organic fluorescent substance may be 0.005 to 2 parts by weight based on 100 parts by weight of the resin matrix included in the color conversion layer.
According to an exemplary embodiment of the present application, the thickness of the color conversion layer may be 1 μm to 200 μm, for example, 2 μm to 50 μm.
The color conversion layer can be manufactured by using the following method: a method including applying a resin solution in which an organic fluorescent substance is dissolved or dispersed onto a substrate and drying the resin solution applied onto the substrate, or a method including extruding an organic fluorescent substance together with a resin.
When the fluorescent substance is an organic fluorescent substance, the organic fluorescent substance is uniformly distributed in the resin solution because the organic fluorescent substance is dissolved in the resin solution, and thus a separate dispersion process is not required.
If necessary, additives may be added to the resin solution, for example, light diffusers (light diffusers) such as silica, titania, zirconia, and alumina powders may be added. In addition, a dispersant may be additionally added to stably disperse the light diffusion particles.
The method for preparing the resin solution in which the organic fluorescent substance is dissolved or dispersed is not particularly limited as long as the resin solution is in a state in which the organic fluorescent substance and the resin are dissolved or dispersed in the solution.
According to an example, a resin solution in which an organic fluorescent substance is dissolved may be prepared by: the method includes preparing a first solution by dissolving an organic fluorescent substance in a solvent, preparing a second solution by dissolving a resin in a solvent, and mixing the first solution and the second solution. When the first solution and the second solution are mixed, it is preferable to uniformly mix the solutions. However, the method is not limited thereto, and a method of simultaneously adding and dissolving the organic fluorescent substance and the resin in the solvent, a method of dissolving the organic fluorescent substance in the solvent and then adding and dissolving the resin, a method of dissolving the resin in the solvent and then adding and dissolving the organic fluorescent substance, and the like may be used.
As the resin contained in the solution, the above-described resin base material, a monomer curable by the resin base material, or a mixture thereof can be used. Examples of the monomer curable by the resin matrix include a (meth) acrylic monomer, and the monomer can be formed into a resin matrix material by UV curing. When the curable monomer is used as described above, an initiator required for curing may be further added, if necessary.
The solvent is not particularly limited, and is not particularly limited as long as the solvent can be removed by subsequent drying without adversely affecting the coating process. As non-limiting examples of the solvent, toluene, xylene, acetone, chloroform, various alcohol-based solvents, Methyl Ethyl Ketone (MEK), methyl isobutyl ketone (MIBK), Ethyl Acetate (EA), butyl acetate, cyclohexanone, Propylene Glycol Methyl Ethyl Acetate (PGMEA), bis (methyl ethyl ketone), bis (methyl
Figure GDA0001832912550000131
An alkane, Dimethylformamide (DMF), dimethylacetamide (DMAc), Dimethylsulfoxide (DMSO), N-methyl-pyrrolidone (NMP), or the like, and one type or a mixture of two or more types may be used. When the first solution and the second solution are used, the solvents contained in the solutions may also be the same as or different from each other. Even when different solvents are used in the first solution and the second solution, it is preferable that these solvents have compatibility so as to be mixed with each other.
The process of applying the resin solution in which the organic fluorescent substance is dissolved to the substrate may use a roll-to-roll (roll-to-roll) method. For example, the method may be performed by: the substrate is unwound from a roll on which the substrate is wound, a resin solution in which an organic fluorescent substance is dissolved is applied to one surface of the substrate, the resin solution is dried, and then the substrate is wound again on the roll. When the roll-to-roll method is used, it is preferable that the viscosity of the resin solution is determined within a range in which the method can be carried out, and the viscosity can be determined within a range of, for example, 200cps to 2000 cps.
As the coating method, various known methods may be used, for example, a die coater may also be used, and various bar coating methods such as a screen coater, a comma coater (comma coater), and a reverse comma coater (reverse comma coater) may also be used.
After coating, a drying process is performed. The drying process may be carried out under conditions required to remove the solvent. For example, a color conversion layer containing a fluorescent substance having a desired thickness and concentration can be obtained on a substrate by drying in an oven positioned close to a coater in the direction in which the substrate advances during a coating process under conditions in which a solvent is sufficiently evaporated.
When a color shift compensation polymer is included in the color conversion layer, the color shift compensation polymer may be added to a composition used in manufacturing the color conversion layer described above.
If necessary, the color shift compensation layer can be manufactured by coating a composition including a color shift compensation polymer on at least one surface of the color conversion layer and drying or curing the composition.
The color shift compensation layer may be manufactured by a method of coating the composition onto a transparent substrate, a solution casting method, an extrusion and stretching method, and the like. In this case, when extrusion molding is performed as a method of forming the migration compensation layer, resins such as Polycarbonate (PC), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), and Styrene Acrylonitrile (SAN) may be used together with the migration compensation polymer.
In the present application, the color shift correction film may mean a color shift compensation layer, and may be manufactured by the same method as the method of manufacturing the color shift compensation layer.
When a monomer curable by a resin matrix is used as the resin contained in the solution, curing, such as UV curing, may be performed before or simultaneously with drying.
When the organic fluorescent substance is formed into a film by extrusion with a resin, an extrusion method known in the art may be used, and for example, the color conversion layer may be manufactured by extruding the fluorescent substance together with a resin, such as a Polycarbonate (PC) -based resin, a poly (meth) acrylic resin, and a styrene-acrylonitrile (SAN) -based resin.
Another exemplary embodiment of the present application provides a backlight unit including the color conversion film described above. The backlight unit may have a backlight unit configuration known in the art, except that the backlight unit includes a color conversion film. For example, fig. 5 and 6 show examples of the backlight unit. According to fig. 5, the color conversion film according to the above-described exemplary embodiment is disposed between the light guide plate and the reflection plate. According to fig. 6, the color conversion film according to the above-described exemplary embodiment is disposed on a surface opposite to a surface of the light guide plate facing the reflective plate. Fig. 5 and 6 show a configuration including a light source and a reflection plate surrounding the light source, but the configuration is not limited to such a structure and may be modified according to the structure of a backlight unit known in the art. Further, a direct type and a side chain type may be used as the light source, and if necessary, the reflection plate or the reflection layer may be omitted or replaced with other configurations, and if necessary, additional films such as a light diffusion film, a light collecting film, a brightness enhancement film, and the like may be additionally provided.
In the configuration of the backlight unit as shown in fig. 5 and 6, a diffusion pattern may be provided on an upper surface or a lower surface of the light guide plate, if necessary. Fig. 7 shows an example in which a scattering pattern is provided on a lower surface (i.e., a surface facing the reflection plate) of the light guide plate, and fig. 8 shows an example in which a scattering pattern is provided on an upper surface (i.e., a surface opposite to a surface facing the reflection plate) of the light guide plate. The light incident into the light guide plate has an uneven light distribution caused by repeated optical processes such as reflection, total reflection, refraction, and transmission, and a scattering pattern may be used to guide the uneven light distribution into uniform brightness.
According to still another exemplary embodiment of the present application, a display device including the above-described backlight unit is applied. The display device is not particularly limited as long as the device includes the above-described backlight unit as a constituent element. For example, a display device includes a display module and a backlight unit. Fig. 9 and 10 show the structure of the display device. Fig. 9 shows a case where a color conversion film is provided between the light guide plate and the reflection plate, and fig. 10 shows a case where a color conversion film is provided on a surface opposite to a surface of the light guide plate facing the reflection plate. However, the structure is not limited thereto, and additional films such as a light diffusion film, a light collecting film, a brightness enhancement film, and the like may be further provided between the display module and the backlight unit, if necessary.
Modes for carrying out the invention
Hereinafter, the present invention will be described in more detail by examples. However, the following examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.
Examples
A polymer solution was prepared by dissolving a green fluorescent substance having the following structure in a polystyrene solution in DMF. In this case, 1 part by weight of the fluorescent substance was used based on 100 parts by weight of polystyrene. The solution has a solids content of 20% by weight and a viscosity of 200 cps. The solution was coated on a PET substrate and then dried, thereby manufacturing a first color conversion layer (green color conversion layer) in the form of a film.
Figure GDA0001832912550000161
A second color conversion layer (red color conversion layer) in the form of a film was manufactured in the same manner as the green color conversion film except that the following red fluorescent substance was used.
Figure GDA0001832912550000162
The first color conversion layer and the second color conversion layer are stacked into two surfaces by a non-support film (NCF) type adhesive, thereby manufacturing a third color conversion layer in the form of a film.
The spectrum of white light evaluated by applying the color conversion film to a backlight unit including a blue light source in an edge-lit system is shown in fig. 11.
A DMF solution having a solid content of 20 wt% was prepared by mixing a polyurethane resin composed of methylene diphenyl diisocyanate (MDI) and an ester-type polyol with a PMMA resin in a ratio of 80:20 parts by weight. Then, it was coated on a PET film to a thickness of 20 μm and dried, thereby manufacturing a color shift compensation layer in the form of a film.
The light guide plate, the third color conversion layer manufactured above, the two prism films, and the APF film are stacked, and the color shift compensation layer is stacked on an upper portion thereof, thereby manufacturing the backlight unit. The light emission spectrum of the backlight unit was measured, and the change in the light characteristics of the color conversion layer and the color shift compensation layer was measured according to the storage time in a state where the backlight unit was continuously driven in an oven at 60 ℃.
Comparative example
A backlight unit was manufactured in the same manner as in the examples, except that the color shift compensation layer was not applied to the examples.
When durability is evaluated at high temperature, in the case of the comparative example to which the color shift compensation layer is not applied, it can be seen that green and red lights are reduced by the reduction of the organic fluorescent substance or the like, and the color difference is continuously widened as compared with the initial stage as blue light is enhanced (comparative example, fig. 12 and table 1 below). In the present specification, color difference means color difference in a specific time (t), and means the equation [ sqrt ((Wx (t) -Wx (initial stage))2+ (Wy (t) -Wy (initial stage))2)]。
[ Table 1]
Time (hours) Variation of chromatic aberration
0 0.000
118 0.011
235 0.018
353 0.019
647 0.039
765 0.044
1000 0.054
In contrast, in the embodiment applied with the color shift compensation layer, as in fig. 13 and table 2, the width of the color difference change according to time is significantly reduced. Further, the color difference change at 1000 hours was 0.012, indicating very excellent results.
[ Table 2]
Time (hours) Variation of chromatic aberration
0 0.000
118 0.002
235 0.003
353 0.003
647 0.008
765 0.009
1000 0.012

Claims (8)

1. A color conversion film comprising:
a color conversion layer comprising a resin matrix and an organic fluorescent substance dispersed in the resin matrix and emitting light having a wavelength different from that of the irradiated light when irradiated with light including a wavelength of 450nm,
wherein the color conversion film comprises a color shift compensation polymer in an additional layer disposed on at least one surface of the color conversion layer, the color shift compensation polymer enabling a color difference change of the emitted white light to be 0.05 or less when the entire surface of the color conversion film is irradiated with blue light having a luminance of 600 nits for 1000 hours at 60 ℃.
2. The color conversion film of claim 1, wherein the color shift compensating polymer is included in the additional layer disposed on at least one surface of the color conversion layer, and the color shift compensating polymer is included in an amount of 10 to 100 wt% based on the total weight of the additional layer.
3. The color conversion film according to claim 1, wherein the blue light is light in which blue light emitted by a light source is converted into a surface light source by a stacked structure of a backlight unit comprising a light guide plate, a light collecting film, and a brightness enhancing film.
4. The color conversion film of claim 1, wherein the blue light has a luminescence peak at 450nm and a full width at half maximum of 30nm or less.
5. The color conversion film of claim 1, further comprising:
a transparent film disposed on at least one surface of the color conversion film.
6. The color conversion film according to claim 1, wherein the color conversion layer comprises one or two or more of an organic fluorescent substance of the following chemical formula 1 and an organic fluorescent substance of the following chemical formula 2:
[ chemical formula 1]
Figure FDA0002992233940000011
In the chemical formula 1, the first and second,
X1and X2Are identical to or different from each other and are each independently a fluoro group or an alkoxy group,
R1to R4Are identical to or different from one another and are each independently hydrogen, a halogen radical, an alkyl radical, an alkoxy radical, a carboxyl-substituted alkyl radical, an unsubstituted or alkoxy-substituted aryl radical, -COOR, or an alkyl radical which is substituted by-COOR, and R is an alkyl radical,
R5and R6Are identical or different from one another and are each independently hydrogen, cyano, nitro, alkyl substituted by carboxyl, -SO3Na, or unsubstituted or arylalkynyl-substituted aryl, R1And R5Optionally linked to each other to form a substituted or unsubstituted hydrocarbon ring or a substituted or unsubstituted heterocyclic ring, and R4And R6Optionally linked to each other to form a substituted or unsubstituted hydrocarbon ring or a substituted or unsubstituted heterocyclic ring, and
R7is hydrogen; an alkyl group; a haloalkyl group; or aryl which is unsubstituted or substituted by halogen groups, alkyl, alkoxy, aryl or alkylaryl groups,
[ chemical formula 2]
Figure FDA0002992233940000021
In the chemical formula 2, the first and second organic solvents,
R11、R12and L are the same as or different from each other, and are each independently hydrogen, alkyl, cycloalkyl, aralkyl, alkylaryl, alkenyl, cycloalkenyl, alkynyl, hydroxyl, mercapto, alkoxy, alkoxyaryl, alkylthio, aryl ether, aryl thioether, aryl, haloaryl, heterocyclic, halogen, haloalkyl, haloalkenyl, haloalkynyl, cyano, aldehyde, carbonyl, carboxyl, ester, carbamoyl, amino, nitro, silyl, or siloxane group, or are linked to an adjacent substituent to form a substituted or unsubstituted aromatic or aliphatic hydrocarbon or heterocyclic ring,
m is a metal of valency M and is boron, beryllium, magnesium, chromium, iron, nickel, copper, zinc or platinum, and
Ar1to Ar5Are the same or different from each other and are each independently hydrogen; an alkyl group; a haloalkyl group; an alkylaryl group; an amine group; unsubstituted or alkoxy-substituted arylalkenyl; or aryl unsubstituted or substituted with hydroxy, alkyl or alkoxy.
7. A backlight unit comprising the color conversion film according to any one of claims 1 to 6.
8. A display device comprising the backlight unit according to claim 7.
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